Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc09565c484c250…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 17:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 342a6e1e6e5d07a2bb3ff0101f7f03d2 SHA-1: 2cb4ed9e54a45019cddfeeb40fcd20cfcdcadbd6 SHA-256: 8dc09565c484c250b0fee8fc92e1c727535807e6e6d916c6b4e4f0cedc4d6842
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links suggests a redirection chain to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=certified+six+sigma+green+belt+question+bank+pdf PDF link annotation
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/mskp26up0pje2jokv1pablk000/58502460736.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e248333bd---86345224955.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/30218458853.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b72481609---43437126452.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/9edaa8c99ee5d313372d704acd692bb7/76934345349.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608e175c7685d---95216126328.pdfPDF link annotation
    • http://dogable.de/userfiles/file/31553907119.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/71840944549.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/31301994545.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/27708293357.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/lurewa.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1d05872d45b37c4f467b386441031d1e/71186195300.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/19676720941.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110f1dbe0e44---lazititidutupatodawasudaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b08ced2e18---tixixazizimamusuzinokutaw.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2a496a24---pemilixagevopav.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/soputejukidenidokeritun.pdfIn PDF document text
    • http://anpo.vn/upload/files/tozokoriwegolokawolumax.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/74652910399.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/f83bc9ac2be8fdc065d2f029d52706c1/xutiwuj.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/49575239951.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16076cc24dfe7f---befofewofulositeno.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/46200586608.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6e41b3e477cee671fafd24c466937105/63591783514.pdfIn PDF document text
    • http://restorationteleconference.com/clients/73716/File/9826373646.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB5 11452 bytes
SHA-256: 3625677a73051d8d2a1b4df5dec9c2f3195253bdaea840ca79373e3aedffd104
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 17904 bytes
SHA-256: 06d5bf8087cab6927ac778e895916079ec3c34e3b26d6f733458a3dcba74351e
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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